Add additional node properties to extra dict

Details

Description

There are many properties which come back from AWS which are not included in the Node.extra dictionary within the ec2 driver. I'll be adding all properties into the extra dict and will cut over the _to_node method to leverage RESOURCE_EXTRA_ATTRIBUTES_MAP.

Issue LIBCLOUD-493: Add extra instance properties that now exist in the
2013-10-15 version of the EC2 API into the Node.extra dictionary. The updates
include block device mapping, VPC information and root device information
among other. All unit tests were updated accordingly and the fixture has
been updated with a more recent XML response.